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2.5十25 x0.4

(0.25 +2.5+ 25)x0.4简便运算=0.25*0.4+2.5*0.4+25*0.4=0.1+1+10=11.1

=0.25*0.4+2.5 *0.4+25 *0.4 =0.1+1+10 =11.1

原式=2.5x0.4-0.25x0.4=1-0.1=0.9 供参考.

=25*0.4*2.5=10*2.5=25

(0.25+2.5+25)*0.4=0.25*0.4+2.5*0.4+25*0.4=0.1+1+10=11.1

(2.5+0.25)乘0.4=2.5乘0.4+0.25乘0.4=1+0.1=1.1

交换相乘得2.5-x=0.4x移项得1.4x=2.5结果x=25/14

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这个的简便运算简单啦,用乘法结合律即可.0.25x2.8x0.4的简便运算为:0.25x2.8x0.4=(0.25x0.4)x2.8=0.1x2.8=0.28.明白了吧!

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